Very recently, a major effort has been undertaken to evaluate the dynamics of quantum Fisher information to establish the validity of quantum entanglement in various quantum metrology scenarios and models. In unitary processes, it has been shown that entanglement leads to a significant improvement in the accuracy of parameter estimation. In fact, the quantum entanglement can be exploited as a quantum resource to exceed the standard quantum limit and achieve the Heisenberg limit [1]}. Furthermore, the gain of information that becomes noise-resistant is essential to promising entanglement in quantum estimation theory [2]}, [3]}. This fact raises an important question ; Can quantum correlations beyond entanglement be related to the estimation precision in quantum metrology protocols ? Is it possible to quantify the quantum correlations in terms of quantum Fisher information ? Several studies have recently been conducted in this direction. Indeed, a quantum correlation quantifier called the local quantum Fisher information has been recently introduced to understand the role of quantum correlation beyond entanglement in a black-box quantum metrology task [4]}. This quantifier is related directly to the quantum Fisher information and also provides the accuracy of an interferometric phase estimate. Local quantum uncertainty [5]}, as another quantum correlation measure, can also be related to the precision in phase estimation protocols. This supports the idea that quantum Fisher information is adding a new tool to the existing list of quantum correlation quantifiers in bipartite quantum systems.
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